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If you've having trouble doing it within ROS launch scripts, there's always bash (e.g., in a shell script, ssh in to remote machine and run roslaunch). Less elegant surely, but more flexible (as long as you're on a linux box).

Also, namespaces can help (/machine/somenode).

Finally, the launch-prefix tag in <node> can, in a limited way, bridge between bash and ROS launch (e.g., use xterm or ssh as a launch-prefix).